AIM To further study the role of bcl 2 protein expression in gastric carcinogenesis and tumor progression. METHODS Using immunohistochemical staining, the bcl 2 protein expression in 50 cases of gastric carcinoma...AIM To further study the role of bcl 2 protein expression in gastric carcinogenesis and tumor progression. METHODS Using immunohistochemical staining, the bcl 2 protein expression in 50 cases of gastric carcinoma and its relation to clinical status and pathomorphological parameters were observed. RESULTS Forty one (82%) cases were positive for bcl 2 protein staining which was located in the cytoplasm and nuclear membrane of tumor cells. The rate of bcl 2 protein expression was not correlated with the patient, sex, tumor size, lymph node status or clinical stages ( P >0 05). It was strongly associated with intestinal type tumors and poorly differentiated tumors ( P <0 05 and P <0 01). CONCLUSION Aberrant bcl 2 protein expression appears to be specifically associated with development of intestinal type gastric carcinoma, bcl 2 protein expression might play an important role in the early development/promotion and phenotypic differentiation of gastric carcinomas, but not in tumor progression.展开更多
AIM To study the expression of Fas and Bcl 2 proteins in BEL 7404 human hepatoma cells in order to analyze the possible relationship between cell growth regulation by alpha fetoprotein(AFP) and Fas/Bcl 2 prot...AIM To study the expression of Fas and Bcl 2 proteins in BEL 7404 human hepatoma cells in order to analyze the possible relationship between cell growth regulation by alpha fetoprotein(AFP) and Fas/Bcl 2 proteins. METHODS BEL 7404 human hepatoma cells were maintained in RPMI 1640 medium supplemented with 10% new born calf serum. Cells adhered to coverslips were used to detect Fas and Bcl 2 protein expression by the avidin biotin complex (ABC) immunocytochemical assay. RESULTS Immunocytochemical study showed that essentially all the BEL 7404 human hepatoma cells could express Fas and Bcl 2 proteins, although in various amounts. No positive staining for Fas and Bcl 2 proteins was observed when cells were incubated with non relevant sera to establish the specificity. CONCLUSION Fas apoptosis signals and Bcl 2 rescue/survival signals from apoptosis are expressed in BEL 7404 human hepatoma cells. The finding strongly implys that AFP mediated cell apoptosis and growth enhancement are potentially associated with Fas and Bcl 2 proteins present in those cells.展开更多
In order to study the effects of ethyl pyruvate on cardiomyocyte apoptosis following ischemia/reperfusion （I/R） in vitro and the expression of Bcl-2 and Bax proteins, isolated rat hearts were perfused in a Langendor...In order to study the effects of ethyl pyruvate on cardiomyocyte apoptosis following ischemia/reperfusion （I/R） in vitro and the expression of Bcl-2 and Bax proteins, isolated rat hearts were perfused in a Langendorff model. Twenty-four rats were randomly divided into 3 groups （n=8 in each group）： control group was perfused for 120 min. In the I/R group, after 30 min stabilization the injury was induced by 30 min global ischemia followed by 60 min reperfusion. Ethyl pyruvate （EP） group was set up with the same protocol as I/R group except that it was supplied with 2 mmol/L EP 15 rain before ischemia and throughout reperfusion. Myocardial malonaldehyde （MDA） content was measured. Myocardial apoptotic index （AI） was tested by terminal deoxynucleotidyl transferase mediated dUTP nick end labeling （TUNEL） method. The expression of anti-apoptotic protein Bcl-2 and pro-apoptotic protein Bax in cardiac myocytes was detected by immunohistochemistry. As compared with control group, the content of MDA, myocardial AI and the expression of Bcl-2, Bax proteins were increased significantly in I/R group, but the content of MDA, myocardial AI and the expression of Bax protein were decreased obviously and the expression of Bcl-2 protein was up-regulated in EP group （P〈0.05）. These results demonstrate that EP could inhibit apoptosis of cardiac myocytes possibly via alleviating oxidative stress, up-regulating Bcl-2 and down-regulating Bax proteins.展开更多
Dioscin is a natural steroid saponin derived from several plants, showing potent anti-cancer effect against a variety of tumor cell lines. In the present study, we investigated the anti-cancer activity of dioscin agai...Dioscin is a natural steroid saponin derived from several plants, showing potent anti-cancer effect against a variety of tumor cell lines. In the present study, we investigated the anti-cancer activity of dioscin against human LNCaP cells, and evaluated the possible mechanism involved in its antineoplastic action. It was found that dioscin（1, 2 and 4 μmol/L） could significantly inhibit the viability of LNCaP cells in a time- and concentration-dependent manner. Flow cytometry revealed that the apoptosis rate was increased after treatment of LNCaP cells with dioscin for 24 h, indicating that apoptosis was an important mechanism by which dioscin inhibited cancer. Western blotting was employed to detect the expression of caspase-3, Bcl-2 and Bax in LNCaP cells. The expression of cleaved caspase-3 was significantly increased, and meanwhile procaspase-3 was markedly decreased. The expression of anti-apoptotic protein Bcl-2 was down-regulated, whereas the pro-apoptotic protein Bax was up-regulated. Moreover, the Bcl-2/Bax ratio was drastically decreased. These results suggested that dioscin possessed potential anti-tumor activity in human LNCaP cells through the apoptosis pathway, which might be associated with caspase-3 and Bcl-2 protein family.展开更多
Objective To study whether there is the apoptosis of neural cells and the expression of Bcl-2 protein in intracerebral hemorrhage (ICH) in model of rats, for the further understanding the mechanism of the delayed dama...Objective To study whether there is the apoptosis of neural cells and the expression of Bcl-2 protein in intracerebral hemorrhage (ICH) in model of rats, for the further understanding the mechanism of the delayed damage of the neural cells around the hematoma after ICH. Methods Fifty SD rats were randomly divided into 5 groups, ten in each. With the Group A as the control, the rest 40 were used to set up intracerebral hemorrhage model. The brains were taken out at 12 th , 24 th , 48 th and 72 th hours, respectively. Apoptosis cells were detected with terminal deoxynucleotidyl transferase mediated dUTP nick end labeling (TUNEL), and the expression of Bcl-2 protein was detected with immunochemical stainging methed (SP). Results In the control group, no apoptosis cells and Bc1-2 protein were detected. In rest groups, the apoptosis cells and Bc1-2 protein were expressed in different degree. Apoptosis rates verified and corresponded with the time after ICH, with the peak at 48 th -72 th hour after hemorrhage. The peak rate of apoptosis cells was (24.50±2.69)% and Bcl-2 protein expression was (20.76±1.97)% . There was significant difference between the experimental groups and control (P<0.05), and no linear relationship between the apoptosis rate and the expression of Bcl-2 protein. Conclusion Apoptosis may be an important factor in the secondary trauma of ICH. There is a time leg after hemorrhage. All this is instructive to clinical treatment in time. Bcl-2 protein keeps increasing in a certain time after hemorrhage, but not synchronize with the cell apoptosis. This indicates that bcl-2 has the effect to reduce the apoptosis of neural cells.展开更多
文摘AIM To further study the role of bcl 2 protein expression in gastric carcinogenesis and tumor progression. METHODS Using immunohistochemical staining, the bcl 2 protein expression in 50 cases of gastric carcinoma and its relation to clinical status and pathomorphological parameters were observed. RESULTS Forty one (82%) cases were positive for bcl 2 protein staining which was located in the cytoplasm and nuclear membrane of tumor cells. The rate of bcl 2 protein expression was not correlated with the patient, sex, tumor size, lymph node status or clinical stages ( P >0 05). It was strongly associated with intestinal type tumors and poorly differentiated tumors ( P <0 05 and P <0 01). CONCLUSION Aberrant bcl 2 protein expression appears to be specifically associated with development of intestinal type gastric carcinoma, bcl 2 protein expression might play an important role in the early development/promotion and phenotypic differentiation of gastric carcinomas, but not in tumor progression.
文摘AIM To study the expression of Fas and Bcl 2 proteins in BEL 7404 human hepatoma cells in order to analyze the possible relationship between cell growth regulation by alpha fetoprotein(AFP) and Fas/Bcl 2 proteins. METHODS BEL 7404 human hepatoma cells were maintained in RPMI 1640 medium supplemented with 10% new born calf serum. Cells adhered to coverslips were used to detect Fas and Bcl 2 protein expression by the avidin biotin complex (ABC) immunocytochemical assay. RESULTS Immunocytochemical study showed that essentially all the BEL 7404 human hepatoma cells could express Fas and Bcl 2 proteins, although in various amounts. No positive staining for Fas and Bcl 2 proteins was observed when cells were incubated with non relevant sera to establish the specificity. CONCLUSION Fas apoptosis signals and Bcl 2 rescue/survival signals from apoptosis are expressed in BEL 7404 human hepatoma cells. The finding strongly implys that AFP mediated cell apoptosis and growth enhancement are potentially associated with Fas and Bcl 2 proteins present in those cells.
文摘In order to study the effects of ethyl pyruvate on cardiomyocyte apoptosis following ischemia/reperfusion （I/R） in vitro and the expression of Bcl-2 and Bax proteins, isolated rat hearts were perfused in a Langendorff model. Twenty-four rats were randomly divided into 3 groups （n=8 in each group）： control group was perfused for 120 min. In the I/R group, after 30 min stabilization the injury was induced by 30 min global ischemia followed by 60 min reperfusion. Ethyl pyruvate （EP） group was set up with the same protocol as I/R group except that it was supplied with 2 mmol/L EP 15 rain before ischemia and throughout reperfusion. Myocardial malonaldehyde （MDA） content was measured. Myocardial apoptotic index （AI） was tested by terminal deoxynucleotidyl transferase mediated dUTP nick end labeling （TUNEL） method. The expression of anti-apoptotic protein Bcl-2 and pro-apoptotic protein Bax in cardiac myocytes was detected by immunohistochemistry. As compared with control group, the content of MDA, myocardial AI and the expression of Bcl-2, Bax proteins were increased significantly in I/R group, but the content of MDA, myocardial AI and the expression of Bax protein were decreased obviously and the expression of Bcl-2 protein was up-regulated in EP group （P〈0.05）. These results demonstrate that EP could inhibit apoptosis of cardiac myocytes possibly via alleviating oxidative stress, up-regulating Bcl-2 and down-regulating Bax proteins.
基金supported by the National Natural Science Foundation of China(No.81173065)
文摘Dioscin is a natural steroid saponin derived from several plants, showing potent anti-cancer effect against a variety of tumor cell lines. In the present study, we investigated the anti-cancer activity of dioscin against human LNCaP cells, and evaluated the possible mechanism involved in its antineoplastic action. It was found that dioscin（1, 2 and 4 μmol/L） could significantly inhibit the viability of LNCaP cells in a time- and concentration-dependent manner. Flow cytometry revealed that the apoptosis rate was increased after treatment of LNCaP cells with dioscin for 24 h, indicating that apoptosis was an important mechanism by which dioscin inhibited cancer. Western blotting was employed to detect the expression of caspase-3, Bcl-2 and Bax in LNCaP cells. The expression of cleaved caspase-3 was significantly increased, and meanwhile procaspase-3 was markedly decreased. The expression of anti-apoptotic protein Bcl-2 was down-regulated, whereas the pro-apoptotic protein Bax was up-regulated. Moreover, the Bcl-2/Bax ratio was drastically decreased. These results suggested that dioscin possessed potential anti-tumor activity in human LNCaP cells through the apoptosis pathway, which might be associated with caspase-3 and Bcl-2 protein family.
文摘Objective To study whether there is the apoptosis of neural cells and the expression of Bcl-2 protein in intracerebral hemorrhage (ICH) in model of rats, for the further understanding the mechanism of the delayed damage of the neural cells around the hematoma after ICH. Methods Fifty SD rats were randomly divided into 5 groups, ten in each. With the Group A as the control, the rest 40 were used to set up intracerebral hemorrhage model. The brains were taken out at 12 th , 24 th , 48 th and 72 th hours, respectively. Apoptosis cells were detected with terminal deoxynucleotidyl transferase mediated dUTP nick end labeling (TUNEL), and the expression of Bcl-2 protein was detected with immunochemical stainging methed (SP). Results In the control group, no apoptosis cells and Bc1-2 protein were detected. In rest groups, the apoptosis cells and Bc1-2 protein were expressed in different degree. Apoptosis rates verified and corresponded with the time after ICH, with the peak at 48 th -72 th hour after hemorrhage. The peak rate of apoptosis cells was (24.50±2.69)% and Bcl-2 protein expression was (20.76±1.97)% . There was significant difference between the experimental groups and control (P<0.05), and no linear relationship between the apoptosis rate and the expression of Bcl-2 protein. Conclusion Apoptosis may be an important factor in the secondary trauma of ICH. There is a time leg after hemorrhage. All this is instructive to clinical treatment in time. Bcl-2 protein keeps increasing in a certain time after hemorrhage, but not synchronize with the cell apoptosis. This indicates that bcl-2 has the effect to reduce the apoptosis of neural cells.
